O&P Powerplant Ch5 Induction Systems – Flashcards
Unlock all answers in this set
Unlock answersquestion
what is the newton used for measuring?
answer
force
question
Name the three components on the induction system of a reciprocating engine.
answer
The air scoop, carburetor or fuel control. and the intake manifold. JSPT 5-2
question
What could happen if the induction system becomes obstructed?
answer
The engine may not be able to produce its rated power or it may not run at all. This may also be an indication of a dirty air filter. JSPT5-2
question
How does induction icing affect engine performance?
answer
It causes a reduction in power and possible erratic operation. JSPT5-3
question
How is induction icing categorized?
answer
As impact ice, fuel evaporation ice, and throttle ice. JSPT 5-3
question
What is the common method used to prevent induction system ice in a reciprocating engine?
answer
Raise the temperature of induction air with a preheater. JSPT 5-3
question
What causes fuel evaporation ice?
answer
Fuel evaporation ice is formed because of the decrease in air temperature resulting from evaporation of the fuel after it is introduced into the air stream. JSPT 5-3
question
Is carburetor throttle ice more likely to occur at a higher or lower power setting? Why?
answer
At a lower power setting because the throttle is partly closed, offering a larger surface are for ice accumulation. JSPT 5-3
question
What may be the indication of leaking intake pipes?
answer
The engine runs tough at low r.p.m. JSPT 5-3
question
What happens to engine power when the carburetor heat is applied?
answer
There is a noticeable drop in power. JSPT 5-4
question
What could happen if carburetor heat is applied at high engine power settings?
answer
Detonation. JSPT5-5
question
What are two types of supercharged induction systems?
answer
Internally driven and externally driven. JSPT 5-6
question
How and at what point does an internally driven supercharger boost air pressure?
answer
An (engine-drive) impeller compresses the fuel/air mixture after it leaves the carburetor. JSPT 5-6
question
What is used to power a turbocharger?
answer
Engine exhaust gas directed onto the turbocharger turbine. JSPT 5-7
question
What could result if the waste gate on a turbocharger system does not close fully?
answer
The engine may not be able to produce its rated power at certain altitudes, and the aircraft may not be capable of reaching critical altitude. JSPT 5-8
question
What function does a turbocharger waste gate perform?
answer
It controls the amount of exhast gas either into or around the turbocharger, thus controlling the boot pressure of the turbocharger. JSPT 5-9
question
What could cause a turbocharged engine to surge?
answer
There could be a waste gate or controller malfunction. JSPT5-10
question
What are the most common ways to control a waste gate?
answer
Either mechanically with linkages to the throttles of a separate control, or by an actuator that is driven by oil pressure. JSPT 5-10
question
In a pressurized reciprocation aircraft, what component in the turbocharger system is used to limit the amount of turbocharger airflow used for cabin pressurization?
answer
The sonic venturi. JSPT 5-14
question
What is the function of a divergent-shaped jet engine inlet during subsonic flight?
answer
It causes the air velocity to decrease with a subsequent increase in air pressure. JSPT 5-17
question
Where are hellmouth inlet ducts typically found?
answer
On helicopter engines. JSPT 5-20
question
How do venturi-type particle separators, found on many turbine powered helicopters, function?
answer
A venturi used to accelerate the flow of incoming air and debris through a curved intake. The debris gains too much inertia to allow it to follow the curved intake towards the engine, and is channeled away from the compressor.
question
What are the most common methods used for anti-icing of turbine engine inlet ducts?
answer
Engine bleed air and electric heating elements. JSPT 5-22
